BACKGROUND:The centrepiece of Bowser Jr's Fearsome Fleet, this huge mech was used as a weapon by Bowser's armies to conquer various other empires and colonies in the outer space surrounding Mushroom World. When Mario came and defeated Gobbleguts, Bowser Jr then brought out this ultimate weapon to defeat that pesky Mario.
Alas for the Koopa Troop, it was defeated by Mario with the assistance of Yoshi, and blown to pieces in the ensuing battle.